. The Street railway journal . ONE TYPE OF THIRD-RAIL INSULATOR with co])per, is i to 11. No feeders have been provided,the various sub-stations feeding directly into the third-railsystem. At each sub-station the third rail is sectionalized,each side being fed from its corresponding feeder the sub-stations will thus work in ])arallel on the direct-current side, as well as on the high-tension alternating-side. Therefore, it may happen that, should the high-. CONNECTIONS BETWEEN THIRD RAIL AND UNDERGROUNDCABLES tension circuit be automatically opened in one of the sub-stations and the
. The Street railway journal . ONE TYPE OF THIRD-RAIL INSULATOR with co])per, is i to 11. No feeders have been provided,the various sub-stations feeding directly into the third-railsystem. At each sub-station the third rail is sectionalized,each side being fed from its corresponding feeder the sub-stations will thus work in ])arallel on the direct-current side, as well as on the high-tension alternating-side. Therefore, it may happen that, should the high-. CONNECTIONS BETWEEN THIRD RAIL AND UNDERGROUNDCABLES tension circuit be automatically opened in one of the sub-stations and the direct-current circuit remain closed, therotary converters of the station would draw current fromthis third rail, and start to run as direct-current motors withthe series field in opposition to the shunt. To eliminate thissource of danger, a reverse-current relay has been attachedto the automatic circuit breakers on the direct-current con-verter panels, which, by means of an auxiliary shunt coil,trips the circuit breakers when the current tends to reverseits normal direction of flow. The track is laid with rails weighing 72 lbs. per yard, placed on wooden cross ties. The length of rails for thenew track laid between Rho and Gallarate is 38 ft., the re-mainder have of 30 ft. The rails are bonded withsingle 0000 B. & S. solid crown bonds, and the rails andtracks cross-connected with the same size of bonds, at in-tervals of 325 ft. The conductivity
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
